Solid state relay, 3 phase, SSR-120DA, 120A 3-32V DC to AC

Features

120A 3-32V DC to 24-480V AC 3-phase solid state relay (SSR) features compact size, high structural strength, good impact resistance, and strong shock resistance. The SSR relay offers a reliable switching commercial and industrial loads, such as computer peripheral interface device, printing machine, molding machine, food machine, packaging machine, and so on.

• Built in RC absorption
• Photoelectric isolation
• SCR output
• LED indicator for operation status
• Removable protective cover for safety
• Panel mount
• Zero-crossing switch type

Specification

Note:

1. When the load is a resistive load, the maximum load current of the selected SSR should be 2~3 times greater than the actual load current;
   
2. When the load is an inductive load, the maximum load current of the selected SSR should be more than 7~8 times the actual load current.
   
3. When the maximum load current is higher than 10A, a heat sink must be installed to the solid state relay, or the SSR relay should be mounted on a metal base plate with heat dissipation effect, and the thermal grease is applied between them.

Heat Sink

Product Name	Heat sink for 3 phase SSR
Material	Aluminum alloy
Dimension (L*W*H)	150*125*135mm
Mounting Size	Mounting Hole Diameter: 3mm Groove Distance: 84mm
Weight	2.1kg
Application	≤150A 3 phase solid state relay

Dimensions (Unit: mm)

Wiring Diagram

Tips: How to choose the current of solid state relay?

Taking into account the fluctuations in grid voltage and large instantaneous current when the load starts, the current of solid state relays (SSR) is generally several times larger than its rated current, and thyristor chip’s resistance to current impact is poor, it is recommended in the selection of the current of SSR, appropriate margin should be left.

1. Resistive load
   The SSR relay nominal current should be twice as large as the rated load current.
2. Inductive load
   The nominal current should be 2.5 times as large as the rated current of the load for light load; 3 times for middle-sized load; and 4 ~ 4.5 times for heavy load.